
Description: PDF Signet is a free tool for applying digital signatures and timestamping to PDF documents. It allows adding legally-binding signatures to PDFs to verify document integrity and authenticity.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Nitro PDF Pro is a premium PDF editor that allows you to create, edit, convert, sign, and secure PDF files. It has an intuitive interface and advanced editing tools for annotating, rearranging pages, adding form fields, reviewing documents and more.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API